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MANDATORILY REDEEMABLE NONCONTROLLING INTEREST (ROLLFORWARD TABLE) (DETAILS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mandatorily redeemable noncontrolling interest [Line Items]      
Mandatorily redeemable noncontrolling interest, January 1 $ 2,814    
Net income attributable to mandatorily redeemable noncontrolling interest 65,885 $ 77,417 $ 71,471
Dividends distributed to noncontrolling interest 3,960 4,275 4,183
Change in redemption value (1,113) (936) (1,677)
Mandatorily redeemable noncontrolling interest, June 30 4,131 2,814  
Iknowtion [Member]      
Mandatorily redeemable noncontrolling interest [Line Items]      
Mandatorily redeemable noncontrolling interest, January 1 2,814 2,509  
Net income attributable to mandatorily redeemable noncontrolling interest 837 613  
Dividends distributed to noncontrolling interest (633) (1,244)  
Change in redemption value 1,113 936  
Mandatorily redeemable noncontrolling interest, June 30 $ 4,131 $ 2,814 $ 2,509